Hello!
I identified a problem when trying to connect to my MQTT server, and I don't know how to solve it.
When my server and my ESP32 (client) are on the same network, but one is connected to the router and the other to a Wi-Fi extender, they cannot see each other. However, if I use the BSSID parameter in WiFi.begin to connect to the same device as my server, the connection works properly. As far as I know, this problem shouldn't happen. Is there any setting I need to change?"
The issue occurs because Wi-Fi extenders create separate network segments (subnets) even though they appear as the same SSID. This can break communication between devices connected to the main router and those connected to the extender
Can you check the both IP of the device if they belong two series it will not get connection easily (without bssid parameter).Check their ip of server and client